Microsemi Corporation
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2N4858
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2N4858 Transistor

Product Overview

The 2N4858 is a transistor belonging to the category of field-effect transistors (FETs). It is commonly used in electronic circuits for amplification and switching applications. The transistor exhibits characteristics such as high input impedance, low noise, and low power consumption. It is typically available in a TO-92 package and is sold individually or in bulk quantities.

Specifications

  • Type: N-channel JFET
  • Maximum Drain-Source Voltage: 40V
  • Maximum Gate-Source Voltage: ±25V
  • Continuous Drain Current: 10mA
  • Power Dissipation: 350mW
  • Operating Temperature Range: -55°C to 150°C

Detailed Pin Configuration

The 2N4858 transistor has three pins: 1. Source (S) 2. Gate (G) 3. Drain (D)

Functional Features

The 2N4858 transistor offers high input impedance, making it suitable for use in high-impedance signal amplification circuits. It also exhibits low noise characteristics, making it ideal for low-noise amplifier designs.

Advantages and Disadvantages

Advantages

  • High input impedance
  • Low noise
  • Low power consumption

Disadvantages

  • Limited maximum drain-source voltage
  • Limited continuous drain current

Working Principles

The 2N4858 operates based on the principle of field-effect modulation. When a voltage is applied to the gate terminal, it modulates the conductivity of the channel between the source and drain, allowing for control of the current flow.

Detailed Application Field Plans

The 2N4858 transistor finds application in various electronic circuits, including: - Audio amplifiers - Instrumentation amplifiers - Signal processing circuits - Low-noise preamplifiers

Detailed and Complete Alternative Models

Some alternative models to the 2N4858 transistor include: - J201 - 2N5457 - MPF102 - BF245

In conclusion, the 2N4858 transistor is a versatile component with applications in various electronic circuits, offering high input impedance and low noise characteristics. While it has limitations in terms of maximum voltage and current, it remains a popular choice for low-power amplification and signal processing applications.

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רשום 10 שאלות ותשובות נפוצות הקשורות ליישום של 2N4858 בפתרונות טכניים

  1. What is the 2N4858 transistor used for?

    • The 2N4858 is a JFET (junction field-effect transistor) commonly used for low-noise amplification and switching applications.

  2. What are the key features of the 2N4858 transistor?

    • The 2N4858 offers low noise, high input impedance, and low input capacitance, making it suitable for high-frequency and low-level signal amplification.

  3. What are the typical applications of the 2N4858 transistor?

    • Typical applications include audio amplifiers, instrumentation amplifiers, low-noise preamplifiers, and high-impedance amplifiers.

  4. What are the important electrical characteristics of the 2N4858 transistor?

    • Key electrical characteristics include its maximum drain-source voltage, drain current, transconductance, and input capacitance.

  5. How does the 2N4858 compare to other JFET transistors in terms of performance?

    • The 2N4858 offers competitive performance in terms of low noise and high input impedance compared to other JFET transistors.

  6. What are the recommended operating conditions for the 2N4858 transistor?

    • The 2N4858 operates within specified ranges of drain-source voltage, drain current, and temperature for optimal performance.

  7. Can the 2N4858 be used in high-frequency applications?

    • Yes, the 2N4858's low input capacitance and high cutoff frequency make it suitable for high-frequency applications.

  8. Are there any specific considerations for biasing the 2N4858 transistor?

    • Proper biasing is essential to ensure the transistor operates within its linear region and achieves the desired performance characteristics.

  9. What are the common packaging options available for the 2N4858 transistor?

    • The 2N4858 is typically available in TO-92 or surface-mount packages, offering flexibility for different circuit designs.

  10. Where can I find detailed datasheets and application notes for the 2N4858 transistor?

    • Detailed datasheets and application notes for the 2N4858 can be found on semiconductor manufacturer websites or distributor platforms.